Namespace subset flags

[benjeffery]

Part of #1720

[codecov]

Codecov Report

Merging #2229 (1757b04) into main (009d45b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2229   +/-   ##
=======================================
  Coverage   93.29%   93.29%           
=======================================
  Files          27       27           
  Lines       25994    25994           
  Branches     1165     1165           
=======================================
  Hits        24251    24251           
  Misses       1713     1713           
  Partials       30       30           

Flag	Coverage Δ
c-tests	92.20% <100.00%> (ø)
lwt-tests	89.05% <ø> (ø)
python-c-tests	72.06% <100.00%> (ø)
python-tests	98.87% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
c/tskit/tables.c	90.28% <100.00%> (ø)
python/_tskitmodule.c	90.96% <100.00%> (ø)

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